[deliverable/linux.git] / drivers / video / backlight / da903x_bl.c

/*
 * Backlight driver for Dialog Semiconductor DA9030/DA9034
 *
 * Copyright (C) 2008 Compulab, Ltd.
 * 	Mike Rapoport <mike@compulab.co.il>
 *
 * Copyright (C) 2006-2008 Marvell International Ltd.
 * 	Eric Miao <eric.miao@marvell.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/mfd/da903x.h>

#define DA9030_WLED_CONTROL	0x25
#define DA9030_WLED_CP_EN	(1 << 6)
#define DA9030_WLED_TRIM(x)	((x) & 0x7)

#define DA9034_WLED_CONTROL1	0x3C
#define DA9034_WLED_CONTROL2	0x3D
#define DA9034_WLED_ISET(x)	((x) & 0x1f)

#define DA9034_WLED_BOOST_EN	(1 << 5)

#define DA9030_MAX_BRIGHTNESS	7
#define DA9034_MAX_BRIGHTNESS	0x7f

struct da903x_backlight_data {
	struct device *da903x_dev;
	int id;
	int current_brightness;
};

static int da903x_backlight_set(struct backlight_device *bl, int brightness)
{
	struct da903x_backlight_data *data = bl_get_data(bl);
	struct device *dev = data->da903x_dev;
	uint8_t val;
	int ret = 0;

	switch (data->id) {
	case DA9034_ID_WLED:
		ret = da903x_update(dev, DA9034_WLED_CONTROL1,
				brightness, 0x7f);
		if (ret)
			return ret;

		if (data->current_brightness && brightness == 0)
			ret = da903x_clr_bits(dev,
					DA9034_WLED_CONTROL2,
					DA9034_WLED_BOOST_EN);

		if (data->current_brightness == 0 && brightness)
			ret = da903x_set_bits(dev,
					DA9034_WLED_CONTROL2,
					DA9034_WLED_BOOST_EN);
		break;
	case DA9030_ID_WLED:
		val = DA9030_WLED_TRIM(brightness);
		val |= brightness ? DA9030_WLED_CP_EN : 0;
		ret = da903x_write(dev, DA9030_WLED_CONTROL, val);
		break;
	}

	if (ret)
		return ret;

	data->current_brightness = brightness;
	return 0;
}

static int da903x_backlight_update_status(struct backlight_device *bl)
{
	int brightness = bl->props.brightness;

	if (bl->props.power != FB_BLANK_UNBLANK)
		brightness = 0;

	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
		brightness = 0;

	return da903x_backlight_set(bl, brightness);
}

static int da903x_backlight_get_brightness(struct backlight_device *bl)
{
	struct da903x_backlight_data *data = bl_get_data(bl);
	return data->current_brightness;
}

static struct backlight_ops da903x_backlight_ops = {
	.update_status	= da903x_backlight_update_status,
	.get_brightness	= da903x_backlight_get_brightness,
};

static int da903x_backlight_probe(struct platform_device *pdev)
{
	struct da9034_backlight_pdata *pdata = pdev->dev.platform_data;
	struct da903x_backlight_data *data;
	struct backlight_device *bl;
	int max_brightness;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (data == NULL)
		return -ENOMEM;

	switch (pdev->id) {
	case DA9030_ID_WLED:
		max_brightness = DA9030_MAX_BRIGHTNESS;
		break;
	case DA9034_ID_WLED:
		max_brightness = DA9034_MAX_BRIGHTNESS;
		break;
	default:
		dev_err(&pdev->dev, "invalid backlight device ID(%d)\n",
				pdev->id);
		kfree(data);
		return -EINVAL;
	}

	data->id = pdev->id;
	data->da903x_dev = pdev->dev.parent;
	data->current_brightness = 0;

	/* adjust the WLED output current */
	if (pdata)
		da903x_write(data->da903x_dev, DA9034_WLED_CONTROL2,
				DA9034_WLED_ISET(pdata->output_current));

	bl = backlight_device_register(pdev->name, data->da903x_dev,
			data, &da903x_backlight_ops);
	if (IS_ERR(bl)) {
		dev_err(&pdev->dev, "failed to register backlight\n");
		kfree(data);
		return PTR_ERR(bl);
	}

	bl->props.max_brightness = max_brightness;
	bl->props.brightness = max_brightness;

	platform_set_drvdata(pdev, bl);
	backlight_update_status(bl);
	return 0;
}

static int da903x_backlight_remove(struct platform_device *pdev)
{
	struct backlight_device *bl = platform_get_drvdata(pdev);
	struct da903x_backlight_data *data = bl_get_data(bl);

	backlight_device_unregister(bl);
	kfree(data);
	return 0;
}

#ifdef CONFIG_PM
static int da903x_backlight_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct backlight_device *bl = platform_get_drvdata(pdev);
	return da903x_backlight_set(bl, 0);
}

static int da903x_backlight_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct backlight_device *bl = platform_get_drvdata(pdev);

	backlight_update_status(bl);
	return 0;
}

static const struct dev_pm_ops da903x_backlight_pm_ops = {
	.suspend	= da903x_backlight_suspend,
	.resume		= da903x_backlight_resume,
};
#endif

static struct platform_driver da903x_backlight_driver = {
	.driver		= {
		.name	= "da903x-backlight",
		.owner	= THIS_MODULE,
#ifdef CONFIG_PM
		.pm	= &da903x_backlight_pm_ops,
#endif
	},
	.probe		= da903x_backlight_probe,
	.remove		= da903x_backlight_remove,
};

static int __init da903x_backlight_init(void)
{
	return platform_driver_register(&da903x_backlight_driver);
}
module_init(da903x_backlight_init);

static void __exit da903x_backlight_exit(void)
{
	platform_driver_unregister(&da903x_backlight_driver);
}
module_exit(da903x_backlight_exit);

MODULE_DESCRIPTION("Backlight Driver for Dialog Semiconductor DA9030/DA9034");
MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>"
	      "Mike Rapoport <mike@compulab.co.il>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da903x-backlight");
Commit	Line	Data
923ae48b MR	1	/*
	2	* Backlight driver for Dialog Semiconductor DA9030/DA9034
	3	*
	4	* Copyright (C) 2008 Compulab, Ltd.
	5	* Mike Rapoport <mike@compulab.co.il>
	6	*
	7	* Copyright (C) 2006-2008 Marvell International Ltd.
	8	* Eric Miao <eric.miao@marvell.com>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*/
	14
	15	#include <linux/kernel.h>
	16	#include <linux/init.h>
	17	#include <linux/platform_device.h>
	18	#include <linux/fb.h>
	19	#include <linux/backlight.h>
	20	#include <linux/mfd/da903x.h>
	21
	22	#define DA9030_WLED_CONTROL 0x25
	23	#define DA9030_WLED_CP_EN (1 << 6)
	24	#define DA9030_WLED_TRIM(x) ((x) & 0x7)
	25
	26	#define DA9034_WLED_CONTROL1 0x3C
	27	#define DA9034_WLED_CONTROL2 0x3D
b3a85495	28	#define DA9034_WLED_ISET(x) ((x) & 0x1f)
923ae48b MR	29
	30	#define DA9034_WLED_BOOST_EN (1 << 5)
	31
	32	#define DA9030_MAX_BRIGHTNESS 7
	33	#define DA9034_MAX_BRIGHTNESS 0x7f
	34
	35	struct da903x_backlight_data {
	36	struct device *da903x_dev;
	37	int id;
	38	int current_brightness;
	39	};
	40
	41	static int da903x_backlight_set(struct backlight_device *bl, int brightness)
	42	{
	43	struct da903x_backlight_data *data = bl_get_data(bl);
	44	struct device *dev = data->da903x_dev;
	45	uint8_t val;
	46	int ret = 0;
	47
	48	switch (data->id) {
	49	case DA9034_ID_WLED:
	50	ret = da903x_update(dev, DA9034_WLED_CONTROL1,
	51	brightness, 0x7f);
	52	if (ret)
	53	return ret;
	54
	55	if (data->current_brightness && brightness == 0)
	56	ret = da903x_clr_bits(dev,
	57	DA9034_WLED_CONTROL2,
	58	DA9034_WLED_BOOST_EN);
	59
	60	if (data->current_brightness == 0 && brightness)
	61	ret = da903x_set_bits(dev,
	62	DA9034_WLED_CONTROL2,
	63	DA9034_WLED_BOOST_EN);
	64	break;
	65	case DA9030_ID_WLED:
	66	val = DA9030_WLED_TRIM(brightness);
	67	val \|= brightness ? DA9030_WLED_CP_EN : 0;
	68	ret = da903x_write(dev, DA9030_WLED_CONTROL, val);
	69	break;
	70	}
	71
	72	if (ret)
	73	return ret;
	74
	75	data->current_brightness = brightness;
	76	return 0;
	77	}
	78
	79	static int da903x_backlight_update_status(struct backlight_device *bl)
	80	{
	81	int brightness = bl->props.brightness;
	82
	83	if (bl->props.power != FB_BLANK_UNBLANK)
	84	brightness = 0;
	85
	86	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
	87	brightness = 0;
	88
	89	return da903x_backlight_set(bl, brightness);
	90	}
	91
	92	static int da903x_backlight_get_brightness(struct backlight_device *bl)
93	{
94	struct da903x_backlight_data *data = bl_get_data(bl);
95	return data->current_brightness;
96	}
97
98	static struct backlight_ops da903x_backlight_ops = {
99	.update_status = da903x_backlight_update_status,
100	.get_brightness = da903x_backlight_get_brightness,
101	};
102
103	static int da903x_backlight_probe(struct platform_device *pdev)
104	{
b3a85495	105	struct da9034_backlight_pdata *pdata = pdev->dev.platform_data;
923ae48b MR	106	struct da903x_backlight_data *data;
	107	struct backlight_device *bl;
	108	int max_brightness;
	109
	110	data = kzalloc(sizeof(*data), GFP_KERNEL);
	111	if (data == NULL)
	112	return -ENOMEM;
	113
	114	switch (pdev->id) {
	115	case DA9030_ID_WLED:
	116	max_brightness = DA9030_MAX_BRIGHTNESS;
	117	break;
	118	case DA9034_ID_WLED:
	119	max_brightness = DA9034_MAX_BRIGHTNESS;
	120	break;
	121	default:
	122	dev_err(&pdev->dev, "invalid backlight device ID(%d)\n",
	123	pdev->id);
c0d861af	124	kfree(data);
923ae48b MR	125	return -EINVAL;
	126	}
	127
	128	data->id = pdev->id;
	129	data->da903x_dev = pdev->dev.parent;
	130	data->current_brightness = 0;
	131
b3a85495 HZ	132	/* adjust the WLED output current */
	133	if (pdata)
	134	da903x_write(data->da903x_dev, DA9034_WLED_CONTROL2,
	135	DA9034_WLED_ISET(pdata->output_current));
	136
923ae48b MR	137	bl = backlight_device_register(pdev->name, data->da903x_dev,
	138	data, &da903x_backlight_ops);
	139	if (IS_ERR(bl)) {
	140	dev_err(&pdev->dev, "failed to register backlight\n");
f55491a4	141	kfree(data);
923ae48b MR	142	return PTR_ERR(bl);
	143	}
	144
	145	bl->props.max_brightness = max_brightness;
	146	bl->props.brightness = max_brightness;
	147
	148	platform_set_drvdata(pdev, bl);
	149	backlight_update_status(bl);
	150	return 0;
	151	}
	152
	153	static int da903x_backlight_remove(struct platform_device *pdev)
	154	{
	155	struct backlight_device *bl = platform_get_drvdata(pdev);
	156	struct da903x_backlight_data *data = bl_get_data(bl);
	157
	158	backlight_device_unregister(bl);
	159	kfree(data);
	160	return 0;
	161	}
	162
	163	#ifdef CONFIG_PM
43ddc006	164	static int da903x_backlight_suspend(struct device *dev)
923ae48b	165	{
43ddc006	166	struct platform_device *pdev = to_platform_device(dev);
923ae48b MR	167	struct backlight_device *bl = platform_get_drvdata(pdev);
	168	return da903x_backlight_set(bl, 0);
	169	}
	170
43ddc006	171	static int da903x_backlight_resume(struct device *dev)
923ae48b	172	{
43ddc006	173	struct platform_device *pdev = to_platform_device(dev);
923ae48b MR	174	struct backlight_device *bl = platform_get_drvdata(pdev);
	175
	176	backlight_update_status(bl);
	177	return 0;
	178	}
43ddc006	179
47145210	180	static const struct dev_pm_ops da903x_backlight_pm_ops = {
43ddc006 MR	181	.suspend = da903x_backlight_suspend,
	182	.resume = da903x_backlight_resume,
	183	};
923ae48b MR	184	#endif
	185
	186	static struct platform_driver da903x_backlight_driver = {
	187	.driver = {
	188	.name = "da903x-backlight",
	189	.owner = THIS_MODULE,
43ddc006 MR	190	#ifdef CONFIG_PM
	191	.pm = &da903x_backlight_pm_ops,
	192	#endif
923ae48b MR	193	},
	194	.probe = da903x_backlight_probe,
	195	.remove = da903x_backlight_remove,
923ae48b MR	196	};
	197
	198	static int __init da903x_backlight_init(void)
	199	{
	200	return platform_driver_register(&da903x_backlight_driver);
	201	}
	202	module_init(da903x_backlight_init);
	203
	204	static void __exit da903x_backlight_exit(void)
	205	{
	206	platform_driver_unregister(&da903x_backlight_driver);
	207	}
	208	module_exit(da903x_backlight_exit);
	209
	210	MODULE_DESCRIPTION("Backlight Driver for Dialog Semiconductor DA9030/DA9034");
	211	MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>"
	212	"Mike Rapoport <mike@compulab.co.il>");
	213	MODULE_LICENSE("GPL");
	214	MODULE_ALIAS("platform:da903x-backlight");